1. AO stands for (USN Rating) Aviation Ordnanceman
  2. AO stands for Aaron Owens (streetball player)
  3. AO stands for Abdominal Obesity
  4. AO stands for Abgabenordnung (German tax regulations)
  5. AO stands for Abnormal Occurrence
  6. AO stands for Abort Output (TELNET protocol)
  7. AO stands for Academy of Osseointegration
  8. AO stands for Access Opening
  9. AO stands for Access Ordering
  10. AO stands for Accommodation Officer
  11. AO stands for Accompanying Object
  12. AO stands for Account Of
  13. AO stands for Account Owner
  14. A/O stands for Accounting Only
  15. AO stands for Accounts Office
  16. AO stands for Accredited Organization
  17. AO stands for ACCS (Army Command and Control System) OSI (Operator System Interface)
  18. A/O stands for Acoustic/Optic (spectroscopy)
  19. AO stands for Acousto Optics
  20. AO stands for Acquisition Objective
  21. AO stands for Acridine Orange
  22. AO stands for Acronym Overload
  23. AO stands for Action Officer
  24. AO stands for Action Oriented
  25. AO stands for Active Optical
  26. AO stands for Adaptive Onestep (IEEE)
  27. AO stands for Adaptive Optics
  28. AO stands for Adjustable Objective (rifle telescopic sight)
  29. AO stands for Administration Officer
  30. AO stands for Administrative Office/ Officer
  31. AO stands for Administrative Order
  32. AO stands for Admit One
  33. AO stands for Adults Only
  34. AO stands for Adults Only (ESRB game rating, 18 yrs. and up; graphic sex/violence)
  35. AO stands for Advanced Organization (Church of Scientology)
  36. AO stands for Advisory Opinion
  37. AO stands for Aerial Observer
  38. AO stands for Aeronautical Orders (orders authorizing a military person to perform duties in flight)
  39. AO stands for Aerosol Obscurant
  40. AO stands for Afrique Orientale (German East Africa)
  41. AO stands for Age Old
  42. AO stands for Agent Orange (herbicidal warfare)
  43. AO stands for Air Observer
  44. AO stands for Air Officer
  45. AO stands for Air Operation
  46. AO stands for Air Overseas, Inc.
  47. AO stands for Aircraft Operator
  48. AO stands for Airdrome Officer
  49. A/O stands for Alert and Oriented (charting a patient’s mental status)
  50. AO stands for Alexander Ovechkin (hockey player)
  51. AO stands for All Out
  52. AO stands for Alpha et Omega (epigraphy)
  53. AO stands for Ambient Occlusion (graphics)
  54. AO stands for Ambleside Online (homeschool curriculum)
  55. AO stands for Ambulance Officer (ambulance service; chiefly Australian)
  56. AO stands for American Optical
  57. AO stands for American Outfitters (store)
  58. AO stands for American Outlaws (soccer fan group)
  59. AO stands for Among Others
  60. AO stands for Amphibious Operation
  61. AO stands for Analog Output
  62. A/O stands for Analog Output
  63. AO stands for Anarchy Online (internet game)
  64. AO stands for Anarchy-Online (PC MMORPG)
  65. AO stands for And Others
  66. AO stands for Anglicans Online
  67. AO stands for Angola
  68. AO stands for Annotated Outline
  69. AO stands for Announcement of Opportunity
  70. AO stands for Annoying Orange (Youtube channel)
  71. AO stands for Anodal Opening
  72. AO stands for Answers Only (educational testing)
  73. AO stands for AntiOnline (computer security website)
  74. AO stands for Anti-Oxidant
  75. AO stands for Aortagram
  76. AO stands for Aosta (Val d’Aosta, Italy)
  77. AO stands for Apostolic Oblates
  78. AO stands for Appeals Office(r)
  79. AO stands for Application Object
  80. AO stands for Application Outsourcing
  81. AO stands for Applied Optics
  82. AO stands for Approximate Optimum Method
  83. AO stands for Arbeitsgemeinschaft für Osteosynthesefragen (Association for the Study of Internal Fixation)
  84. AO stands for Archives of Ontario
  85. AO stands for Arctic Ocean
  86. AO stands for Arctic Oscillation
  87. AO stands for Area of Operation
  88. A/O stands for Area of Operations
  89. AO stands for Area Office
  90. AO stands for Argentum Online
  91. AO stands for Arkansas and Ozarks Railway
  92. A/O stands for As Of
  93. AO stands for Asia Onlus (Rome, Italy)
  94. AO stands for Assembly Order
  95. AO stands for Assessing Officer (tax; India)
  96. AO stands for Assessment Objective
  97. AO stands for Assignment Officer
  98. AO stands for Assisted Opener (type of knife)
  99. AO stands for Assisted Operations
  100. AO stands for Associate Office
  101. AO stands for Associate Post Office (also called associate office)
  102. AO stands for Associated Object
  103. AO stands for Association Orukutuku
  104. AO stands for Asylum Officer (US DHS)
  105. A/O stands for At Once
  106. AO stands for Atelosteogenesis
  107. AO stands for Athlitikos Omilos (Greek: Athletic Club)
  108. AO stands for Atlantic Ocean
  109. AO stands for Atlanto-Occipital (joint)
  110. AO stands for Atlas Orthogonal (chiropractic technique; also seen as AOT)
  111. AO stands for Atmosphere-Ocean
  112. AO stands for Atomic Operation
  113. AO stands for Atomic Orbital
  114. AO stands for Atomic Oxygen
  115. A/O stands for Atomic Weight Percent
  116. AO stands for Attack Objective
  117. AO stands for Attendees Only
  118. AO stands for Atualidades Ornitológicas (Ivaiporã-PR, Brazil)
  119. AO stands for Audit Office
  120. AO stands for Auslandsorganisation (foreign section of NSdAP)
  121. AO stands for Australian Airlines (IATA airline code)
  122. AO stands for Australian Open (tennis tournament)
  123. AO stands for Authentic Orginal (retail)
  124. AO stands for Authorized Outage
  125. AO stands for Authorizing Official (for IMPAC Purchases)
  126. AO stands for Automags Online
  127. AO stands for Automated Office
  128. AO stands for Automated Operations
  129. AO stands for Autonomous Okrug
  130. AO stands for Autres Objets (Canada universal postal union)
  131. AO stands for Auxiliary Oiler (Ship Type)
  132. AO stands for Auxiliary Operator (nuclear industry)
  133. AO stands for Aviation Officer
  134. AO stands for Aviation Ordnance Person (US DoD)
  135. AO stands for Awards and Obligations
  136. AO stands for Fly Outs (baseball statistic)
  137. AO stands for Office of the Administrator
  138. AO stands for Officer of the Order of Australia
  139. AO stands for Operational Availability
  140. AO stands for Order of Australia
  141. AO stands for Other Articles (US postal service)
A/O
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Abbreviations And Their Meaning